package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

@Component
public class LoginInterceptor implements HandlerInterceptor {


    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
/*

        //        //1.获取session
//        HttpSession session = request.getSession();

        //TODO 获取请求头中的token
        String token = request.getHeader("authorization");
        //TODO 判断token是否存在
        if (StrUtil.isBlank(token)) {
            //4.不存在，拦截 返回登录页面
            response.setStatus(401);
            return false;

        }


//        //2.获取session中的用户
//        Object user = session.getAttribute("user");

        //TODo 此处改为从redis中获取用户信息
        String key = LOGIN_USER_KEY + token;
        //通过key来获取用户信息
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        //3.判断用户是否存在
//        if (user == null) {
//            //4.不存在，拦截 返回登录页面
//            response.setStatus(401);
//            return false;
//        }

        if (userMap.isEmpty()) {
//            4.不存在，拦截 返回登录页面
            response.setStatus(401);
            return false;
        }

        //TODO 将查询到的hash数据封装为UserDTO对象，
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //


        //5.存在，把用户信息保存在ThreadLocal
        UserHolder.saveUser(userDTO);

        //TODO 刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);
        //6.放行
        */


        //1.判断是否需要拦截（ThreadLocal中是否有用户）

        if (UserHolder.getUser() == null) {
            //没有，需要拦截，设置状态码
            response.setStatus(401);
            return false;
        }
        //有，不需要拦截
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
